App Overview

Date Wheel date calculator icon

Date Wheel date calculator

Creative Algorithms · Business

Date Wheel™ is an award-winning date calculator that calculates time between two dates in months, weeks, days, & business days

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.7
97 ratings · Top 15%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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A product spec, screen plans, and build steps for your coding agent.

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What's included17 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Date Wheel date calculator: map the core Business workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Allow users to create custom calculation presets

Assumption to check: Limited customization options for date calculations

Validate with people who use this workflow before building.

Hypothesis 2

Implement a graphical timeline for calculated dates

Assumption to check: Lack of visual representation of date changes

Validate with people who use this workflow before building.

Hypothesis 3

Enable users to save and quickly access frequently used calculations

Assumption to check: No option to save favorite calculations

Validate with people who use this workflow before building.

Hypothesis 4

Simplify navigation and enhance UI design for better user experience

Assumption to check: Current UI can be clunky

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Date Wheel™ is an award-winning date calculator that calculates time between two dates in months, weeks, days, & business days. ● Save calculations for future reference. ● Countdown to an important date or event. If you want to try before you buy, check out our free web version at: http://datewheel.net With Date Wheel™, you can: + Calculate shipping time in business days + Calculate tooling timing in weeks + Determine when to schedule your next appointment + Determine your pregnancy due date, track how far along you are, then track the age of your newborn in weeks, days, or months + Determine when a project should start, then figure out how long a project is overdue Use for both business & personal applications— anytime you need to quickly calculate the time between two dates. DateWheel was designed by a former project manager. FEATURES ● Calculates end date, start date, or duration in REAL TIME—oldest field automatically updates. Great for tweaking dates and duration. ● Time units in months, weeks, days, & business days ● Save calculations for future reference. Flick thru saved calcs or directly select a calc. Reorder or edit. ● Use locks to to keep preferred area constant ● Enter dates & duration manually, or increment using arrow buttons ● Single arrow buttons increment/decrement by one day, double arrows by one week for easy changes to original entries ● Use Today checkbox to go quickly to today's date or to create a countdown by checking the box by the start date. Field updates daily to count down to an event. ● Use the Today checkbox in the end date to daily track how long a task is taking or how old someone is. Field updates daily and increments duration. ● Intuitive user interface, fine-tuned from years of customer user feedback ● View day-of-the-week for start & end dates ● Financial (30 day) months with three decimal places ● Support for VoiceOver ● Backup on iTunes or iCloud Backup ● Also supports iPhone 6 and 6+ APPLICATIONS + Project Planning + Program Management + Lead Time estimating + Countdown days before important events, such as wedding, vacation or other major event + Time Management + Court date & contract planning + Financial forecasting + Medical timing as in pregnancy due dates + Insurance timing, such as disability dates + Commonly used in Automotive, Construction, Real Estate, Insurance, & Medical Industries + Track when shipments are due to arrive + Project when events are expected to start + Calculate how long something is overdue + Figure out when to schedule your next haircut + Count down the days until your next paycheck + Find the day of the week for any past, present, or future date + Calculate the Julian date of any day by setting start date to 12/31 TESTIMONIALS "I've tried several date calculators and keep coming back to Date Wheel. It has the best user interface."-DM "I LOVE [Date Wheel] and rely on it as an attorney to circumvent going beyond any due dates."-Jason A "I...recommend it to anyone working with schedules on a [mobile]. Date Wheel is the most critical and utilized application on my [mobile]."-MJL "One of my favourite programs and I find it mighty useful."-Sammy McLoughlin, PalmAddict "...the best date calculator around"-Joel "Deceptively simple yet precise program"-Kevin Agot "...A useful tool for project planning, time management, estimating lead times, (to) count down to an important event, estimate shipping and arrival times, determine the exact age of a relative or friend...Ever try to calculate these kinds of things in your head or using a calendar?"-Handheld Computing -------------- Also by Creative Algorithms: - Trip Boss™ travel manager, available in 4 editions - Serving Sizer™ recipe manager, available in 2 editions for iPhone, one for iPad --------------

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
react-navigation
expo-date-picker
react-native-dropdown-picker
BUILD KIT DIFFICULTY
Starter

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.